How can I reset my password?

What do you mean by "reset"?

Forgotten password:

If you forgot your Apple ID password --> https://support.apple.com/HT201487

Change a known password:

Change your Apple ID password --> https://support.apple.com/HT201355

What to do after you change your Apple ID or password --> https://support.apple.com/HT204071

Do you know the current password? Change your Apple ID password - Apple Support